According to the info I've gathered from various sources, one of which is a best friend with an impressive collection I've seen firsthand, as well as old magazine ads and catalogs:
-Edelbrock, Edmunds (water heated), Fenton (squared ends), Fenton (rounded ends), Nicson (heated and unheated), and Thickstun (dogbone style) all offered 1-barrel duals with the SAE 3 size carb base. I was also guessing the Weiand PG dual used SAE 3 carbs, but haven't confirmed. Sharp made a PG dual, also guessing/assuming it's SAE 3.
-Fred's Speed Equipment made an unheated triple in SAE 3 size (I've only ever seen/heard of the one my friend owns).
I would not consider this an exhaustive list. I know D&S, Edmunds, and VonEsser (speed shop in Chicago) had duals made from the familiar square-ended Fenton pattern, but I don't know what size(s) they came in. Almquist, Chiles, Clifford, MultiPower, and Newhouse made 1-barrel duals but I don't have information on sizes. Chiles, Lee, and Tattersfield offered 1-barrel triples but I don't know the sizes. Some of those I've only seen in advertisements, never in person or in photos. I haven't tried to dig into what Clifford offered and I don't have good info on carb sizes on Offenhauser intakes. It's my understanding that the newer Thickstun stuff for 235 (4-bolt valve cover, short side cover) are more late-model reboot type stuff. I'm not sure where the 235-sized dogbone intake fits into the timeline.
I recall reading somewhere that McGurk made duals with the 235/261 port size, but still used the SAE 2 size carbs. This page seems to confirm that the McGurk Super Dual used the smaller sized carb:
https://images20.fotki.com/v1678/photos/2/100702/16488813/McGurkIntakeFlyer1-vi.jpgLooks like McGurk offered the Competition triple in both sizes:
https://images12.fotki.com/v1677/photos/2/100702/16488813/McGurkIntakeFlyer2-vi.jpgI have a couple late 50s Almquist catalogs, a 1952 Ansen catalog, and a California Bill catalog you can peruse here:
https://public.fotki.com/Chevelle350/stovebolt-reading/almquist5758/https://public.fotki.com/Chevelle350/stovebolt-reading/almquist59/https://public.fotki.com/Chevelle350/stovebolt-reading/ansen52/https://public.fotki.com/Chevelle350/stovebolt-reading/chevspeedequip/Here's a page from the Nicson brochure:
https://public.fotki.com/Chevelle350/stovebolt-reading/nicson/nicson-brochure-1950-3.html
